It is performed in cases of fimbrial adhesions and when there is not total occlusion of the fallopian tube. In the case of fimbrial phimosis, lysis of the fimbrial adhesions is performed with laser CO2 and the aid of a special hook (Donnez hook) which results in the restoration of the distal portion of the fallopian tube. The patency test is performed with a special dye (methylene blue) and the pregnancy rates are high, according to the functional ability of the fallopian tube epithelium.